ITP WE GBB Drum Magazine Adapter for GHK M4/AR GBB Airsoft Variant

ITP WE GBB Drum Magazine Adapter for GHK M4/AR GBB Airsoft Variant Metal Construction Airsoft Magazine Adapter That allows users to use the WE / Armorer Works M4 / AR-15 type gas drum magazines in other systems (Drum Magazine Not Included) Suitable For GHK M4/AR Gas Blow Back GBB Airsoft Rifle That also comes with an HPA adapter designed for the drum magazine, giving users the option to use either green gas or HPA